Personal liberty laws were state statutes enacted in the Northern United States during the mid-19th century aimed at protecting free blacks and fugitive slaves from being captured and returned to slavery. These laws were a direct response to the Fugitive Slave Act of 1850, which required citizens to assist in the capture of escaped slaves and imposed penalties on those who aided them. Personal liberty laws sought to counteract the federal enforcement of slavery and expressed the growing abolitionist sentiment in the North.